# Boulder, CO Haskell meetup (virtual) – Nov 18

**URL:** <https://discourse.haskell.org/t/boulder-co-haskell-meetup-virtual-nov-18/13277>\
**Category:** Events\
**Created:** [November 16, 2025, 3:07pm UTC](https://discourse.haskell.org/t/boulder-co-haskell-meetup-virtual-nov-18/13277 "2025-11-16T15:07:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sellout](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/sellout/32/3421_2.png) [@sellout](https://discourse.haskell.org/u/sellout)\
**Post date:** [November 16, 2025, 3:07pm UTC](https://discourse.haskell.org/t/boulder-co-haskell-meetup-virtual-nov-18/13277/1 "2025-11-16T15:07:31Z")

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Greg Pfeil will introduce “duoids” a simple but unexplored algebraic structure. We‘ll also complain about Haskell features that have gotten in our way. More details at [Duoids and Complaints, Tue, Nov 18, 2025, 5:00 PM | Meetup](https://www.meetup.com/boulder-haskell-programmers/events/311770957)

Everyone is welcome – come socialize with some Colorado functional programmers (and whomever else in the world wants to call in).